/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package testbed.tabcomp;

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;
import javax.swing.plaf.basic.BasicButtonUI;

/**
 * Component to be used as tabComponent; Contains a JLabel to show the text and
 * a JButton to close the tab it belongs to
 */
public class ButtonTabComponent extends JPanel
{
    private final JTabbedPane pane;

    public ButtonTabComponent( final JTabbedPane pane )
    {
        // unset default FlowLayout' gaps
        super( new FlowLayout( FlowLayout.LEFT, 0, 0 ) );
        if( pane == null )
        {
            throw new NullPointerException( "TabbedPane is null" );
        }
        this.pane = pane;
        setOpaque( false );

        // make JLabel read titles from JTabbedPane
        JLabel label = new JLabel()
        {
            public String getText()
            {
                int i = pane.indexOfTabComponent( ButtonTabComponent.this );
                if( i != -1 )
                {
                    return pane.getTitleAt( i );
                }
                return null;
            }
        };

        add( label );
        // add more space between the label and the button
        label.setBorder( BorderFactory.createEmptyBorder( 0, 0, 0, 5 ) );
        // tab button
        JButton button = new TabButton();
        add( button );
        // add more space to the top of the component
        setBorder( BorderFactory.createEmptyBorder( 2, 0, 0, 0 ) );
    }

    private class TabButton extends JButton implements ActionListener
    {
        public TabButton()
        {
            int size = 17;
            setPreferredSize( new Dimension( size, size ) );
            setToolTipText( "close this tab" );
            // Make the button looks the same for all Laf's
            setUI( new BasicButtonUI() );
            // Make it transparent
            setContentAreaFilled( false );
            // No need to be focusable
            setFocusable( false );
            setBorder( BorderFactory.createEtchedBorder() );
            setBorderPainted( false );
            // Making nice rollover effect
            // we use the same listener for all buttons
            addMouseListener( buttonMouseListener );
            setRolloverEnabled( true );
            // Close the proper tab by clicking the button
            addActionListener( this );
        }

        public void actionPerformed( ActionEvent e )
        {
            int i = pane.indexOfTabComponent( ButtonTabComponent.this );
            if( i != -1 )
            {
                pane.remove( i );
            }
        }

        // we don't want to update UI for this button
        public void updateUI()
        {
        }

        // paint the cross
        protected void paintComponent( Graphics g )
        {
            super.paintComponent( g );
            Graphics2D g2 = ( Graphics2D )g.create();
            // shift the image for pressed buttons
            if( getModel().isPressed() )
            {
                g2.translate( 1, 1 );
            }
            g2.setStroke( new BasicStroke( 2 ) );
            g2.setColor( Color.BLACK );
            if( getModel().isRollover() )
            {
                g2.setColor( Color.MAGENTA );
            }
            int delta = 6;
            g2.drawLine( delta, delta, getWidth() - delta - 1, getHeight() -
                delta - 1 );
            g2.drawLine( getWidth() - delta - 1, delta, delta, getHeight() -
                delta - 1 );
            g2.dispose();
        }
    }

    private final static MouseListener buttonMouseListener = new MouseAdapter()
    {
        public void mouseEntered( MouseEvent e )
        {
            Component component = e.getComponent();
            if( component instanceof AbstractButton )
            {
                AbstractButton button = ( AbstractButton )component;
                button.setBorderPainted( true );
            }
        }

        public void mouseExited( MouseEvent e )
        {
            Component component = e.getComponent();
            if( component instanceof AbstractButton )
            {
                AbstractButton button = ( AbstractButton )component;
                button.setBorderPainted( false );
            }
        }
    };
}
